I may be mistaken, but take a quick look at the widget training course on the Nokia forum, it seems that access to the file system with JavaScript is not available on the S60.
http://www.forum.nokia.com/Tools_Docs_and_Code/Documentation/Web_Technologies/
It looks like you should be extracting persistent data from the network.
I would hope that the web browser cache will allow you to request deleted data several times, but only transfer it once.
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